We have discovered a severe bug in fw version 1.2 and 1.3 of the mEDBG controller, which stops the controller to switch to boot mode during fw upgrade. To check your firmware version, connect the kit, open the Atmel Studio command prompt (Tools|Command Line), and type

atfw -t medbg -r

If this returns version 1.0 (shipped in Atmel Studio 6.2) or 1.1, everything is ok. Next programming or debug session, it will be upgraded to 1.4 by SP1.

If it returns 1.2 or 1.3, make a connection between the two boot pads before inserting the kit into the computer to force it into boot mode. You can then upgrade the kit using the following command.

using Atmel Studio 6 (Version: 6.2.1502 - Service Pack 1) and ATmega328P on Xplained mini kit, I get the following error: "The tool specified has been disconnected. Please reconnect the tool or choose another one."

When I follow the procedure in the note from meolsen dated Wed. Oct 22, 2014 - 08:13 AM regarding the problem with the xplained mini kit in the new Atmel Studio 6.2SP1, I get the error message: "No tool is found".

I am certain that it is a problem with the usb driver, even though my device manager (win 7) says, that it is up to date.

Serious problem. I have 30 kits is use - several of them show the same error. But most of them work fine. Please help!!